There are several ways you can try to stop Zombie Pigmen from spawning in the nether by breaking their spawn rules:

1. Place half-slabs on every spot you do not want them to spawn on.
2. Replace the Netherrack or Soul Sand with glass, or any transparent material.*
3. Make sure everything is 1-block high. (Though it'll then be nearly impossible to treverse around).

You can't do anything regarding light levels as Zombie Pigmen spawn in any light condition.

*You can do this to the surrounding area of an overworld portal to prevent them from spawning there.

There are several ways you can try to stop Zombie Pigmen from spawning in the nether by breaking their spawn rules:

1. Place half-slabs on every spot you do not want them to spawn on.
2. Replace the Netherrack or Soul Sand with glass, or any transparent material.*
3. Make sure everything is 1-block high. (Though it'll then be nearly impossible to treverse around).

You can't do anything regarding light levels as Zombie Pigmen spawn in any light condition.

*You can do this to the surrounding area of an overworld portal to prevent them from spawning there.

There are several ways you can try to stop Zombie Pigmen from spawning in the nether by breaking their spawn rules:

1. Place half-slabs on every spot you do not want them to spawn on.
2. Replace the Netherrack or Soul Sand with glass, or any transparent material.^
3. Make sure everything is 1-block high. (Though it'll then be nearly impossible to treverse around).

You can't do anything regarding light levels as Zombie Pigmen as they spawn in any light condition.

^You can do this to the surrounding area of an overworld portal to prevent them from spawning there.

There are several ways you can try to stop Zombie Pigmen from spawning in the nether by breaking their spawn rules:

1. Place half-slabs on every spot you do not want them to spawn on.
2. Replace the Netherrack or Soul Sand with glass, or any transparent material.*
3. Make sure everything is 1-block high. (Though it'll then be nearly impossible to treverse around).

You can't do anything regarding light levels as Zombie Pigmen spawn in any light condition.

*You can do this to the surrounding area of an overworld portal to prevent them from spawning there.